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Device and method for recycling ammonia nitrogen from coking wastewater

A technology for coking wastewater and ammonia recovery, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of increased treatment cost, low recovery efficiency, poor separation selectivity, etc. achieve good chemical stability

Inactive Publication Date: 2014-06-04
SHANXI UNIV
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Problems solved by technology

[0004] In the chemical precipitation method, since the precipitation reaction is carried out above pH 9.0, a certain amount of NaOH needs to be added to the wastewater during the treatment, resulting in excessive alkalinity of the treated wastewater and increased treatment costs, and an excessive amount of chemical substance hydrogen phosphate needs to be introduced into the wastewater Disodium and magnesium dichloride increase the concentration of phosphorus and magnesium in water, resulting in secondary pollution and increased treatment costs
[0005] As a traditional wastewater treatment technology, adsorption method can effectively adsorb NH in coking wastewater by using zeolite or resin. 4 + , but the main problem is: the adsorption of NH 4 + The adsorption specificity is poor, there are many interference substances in the complex wastewater system, and the recovery efficiency is low
[0006] Reverse osmosis membrane technology can better remove NH in coking wastewater 4 + , but the pressurization process consumes a lot of energy; for NH 4 + Poor separation selectivity; membrane cleaning and NH in the cleaning solution 4 + There are still many problems faced by recycling
[0007] Ion exchange diffusion dialysis membrane can recover cations and anions in coking wastewater, but due to the NH 4 + Due to poor separation selectivity and other reasons, it is currently only used in the recovery process of high-concentration acid and alkali in wastewater
[0008] Sodium tetraphenylborate can be combined with NH in coking wastewater 4 + Highly selective precipitation reaction (K SP =5.71×10 -8 ), but it is necessary to avoid the dissolution loss of sodium tetraphenylborate in wastewater due to the effect of other ionic salts, which will increase the treatment cost and cause secondary pollution of wastewater

Method used

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  • Device and method for recycling ammonia nitrogen from coking wastewater
  • Device and method for recycling ammonia nitrogen from coking wastewater

Examples

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preparation example Construction

[0038] The preparation of embodiment 1 diffusion dialysis membrane

[0039] Cellulose diacetate (L.R, acetic acid binding capacity 54.5-56%, moisture content ≤ 5.0%), polyethylene glycol 400 (A.R, molecular weight 370-460) and acetone (C.P) are used as membrane materials.

[0040] Preparation:

[0041] (1) Weigh 25g of cellulose diacetate, add 500ml of acetone, and stir on a magnetic stirrer for 24 hours to fully dissolve the cellulose diacetate, and prepare a cellulose diacetate acetone solution with a concentration of 5% (W / V);

[0042] (2) Use a pipette to absorb 20ml of polyethylene glycol 400 and add it to the above-mentioned cellulose diacetate acetone solution, and then leave it to stand for 1 hour after airtight stirring to obtain a film-making solution; the concentration of polyethylene glycol 400 is 4% (V / V);

[0043] (3) Use a commercially available nylon cloth with a pore size of 100 mesh and a thickness of 0.15mm as the carrier, cut it into strips with a width ...

Embodiment 2 4

[0044] Embodiment 2 Preparation of sodium tetraphenylborate-polyethylene glycol 10000 composite precipitant and composite precipitant replenishing liquid

[0045] Composite precipitant preparation:

[0046] (1) Sodium tetraphenylborate (AR) and polyethylene glycol 10000 (AR, molecular weight 8800-11200) are used as raw materials for compound precipitant preparation.

[0047] (2) Weigh 3g of sodium tetraphenylborate and 6g of polyethylene glycol 10000 and dissolve them in 200ml of deionized water respectively, mix the two solutions and set the volume to 500ml to prepare a composite precipitant. The concentration of sodium tetraphenylborate in the composite precipitant is 0.6% (W / V), and the concentration of polyethylene glycol 10000 is 1.2% (W / V).

[0048] Composite precipitant supplement solution preparation:

[0049] Weigh 12.5g of sodium tetraphenylborate and 25g of polyethylene glycol 10000 and dissolve them in 100ml of deionized water respectively, mix the two solutions ...

Embodiment 3

[0050] Embodiment 3 reclaims ammonia nitrogen from coking wastewater

[0051] Assemble the diffusion dialysis device: cut the diffusion dialysis membrane made in Example 1 into 7 membrane blocks with a size of 70mm×100mm, and clamp them in the diffusion dialysis membrane made of 8 PE (polyethylene) plates with a thickness of 1cm respectively. Between the unit, use bolts to compress. The storage capacity of coking wastewater and composite precipitant aqueous solution in the device is 140ml respectively, and the total effective permeable membrane area is 245cm 2 .

[0052] The coking wastewater (taken from a coking plant in Taiyuan, NH 4 + Concentration of 520mg / L, COD concentration of 5103mg / L) 200ml and 500ml of the composite precipitant prepared in Example 2 respectively passed through the diffusion dialysis device with the flow rate of 50ml / min. and 100ml / min. (Such as figure 1 Shown) the respective plate and frame flow channels, the coking wastewater and the composite ...

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Abstract

The invention provides a diffusion dialysis device for recycling NH4<+> from coking wastewater, and a method for treating the coking wastewater and other high-concentration ammonia nitrogen wastewater and recycling the NH4<+> by using the device. The economic feasibility and technical feasibility of the treatment method are fully considered, the high-concentration NH4<+> in the coking wastewater is subjected to the combined technology of membrane diffusion dialysis separation and sodium tetraphenylborate selective precipitation, the aim of removing and recycling NH4<+> from the coking wastewater containing high-concentration ammonia nitrogen and other high-concentration ammonia nitrogen wastewater is achieved, the removal rate of the NH4<+> can be over 95 percent, and the recycling rate of the NH4<+> can be over 90 percent.

Description

Technical field: [0001] The invention relates to waste water treatment, in particular to a method for recovering NH from coking waste water or fertilizer plant waste water containing high concentration of ammonia nitrogen 4 + devices and methods. technical background: [0002] Treatment of High Concentration NH in Coking Wastewater by Traditional Biochemical Method 4 + , there are problems such as large investment, complex operation and management, and difficulty in reaching water standards, and it is impossible to realize the NH 4 + recycling and utilization of resources. [0003] Due to the large consumption of steam by the ammonia distillation method, the treatment of 1m 3 Wastewater needs 1 / 4t of steam, only as high concentration NH in coking wastewater 4 + pretreatment process. [0004] In the chemical precipitation method, since the precipitation reaction is carried out above pH 9.0, a certain amount of NaOH needs to be added to the wastewater during the treat...

Claims

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Application Information

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IPC IPC(8): B01D71/12B01D67/00B01D61/28C02F1/44C02F9/04
Inventor 郭栋生袁小英张翔马莉
Owner SHANXI UNIV
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